Rainbow Electronics MAX8709 - Manual (Page 5)

MAX8709
High-Efficiency CCFL Backlight
Controller with SMBus Interface
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ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1. V BATT = 12V, V LOT = V REF , V CC = V DD, V SUS = 5.3V, T A = -40°C to +85°C. Typical values are at T
A = +25°C,
unless otherwise noted.) (Note 2)
PARAMETER CONDITIONS MIN TYP MAX UNITS
Lamp-Out Detection Timeout Timer V IFB < 0.1V (Note 1) 1.14 1.30 s
SDA, SCL, SUS Input Low Voltage 0.8 V
SDA, SCL, SUS Input High Voltage 2.1 V
SDA, SCL, SUS Input Bias Current -1 +1 µA
SDA Output Low Sink Current V SDA = 0.4V 4 mA
SCL Serial Clock High Period T HIGH 4 µs
SCL Serial Clock Low Period T LOW 4.7 µs
Start-Condition Setup Time t SU:STA 4.7 µs
Start-Condition Hold Time t HD:STA 4 µs
SDA Valid to SCL Rising-Edge Setup Time,
Slave Clocking-In Data
t SU:DAT 250 ns
SCL Falling Edge to SDA Transition t HD:DAT 0 ns
Note 1: Corresponds to 256 DPWM cycles.
Note 2: Specifications to -40°C are guaranteed by design based on final characterization results.
Typical Operating Characteristics
(Circuit of Figure 1. V
BATT
= 12V, V
LOT
= V
REF
, V
CC
= V
DD,
V
SUS
= 5.3V, T
A
= +25°C, unless otherwise noted.)
LOW INPUT-VOLTAGE
OPERATION (V BATT = 8V)
MAX8709 toc01
A: V IFB , 2V/div
B: V VFB , 2V/div
C: V LX1 , 10V/div
D: V LX2 , 10V/div
10µs/div
0V
0V
0V A
B
C
D
0V
HIGH INPUT-VOLTAGE
OPERATION (V BATT = 20V)
MAX8709 toc02
A: V IFB , 2V/div
B: V VFB , 2V/div
C: V LX1 , 10V/div
D: V LX2 , 10V/div
10µs/div
0V
0V
0V A
B
C
D
0V
LINE-TRANSIENT RESPONSE
MAX8709 toc03
A: V BATT , 5V/div
B: V IFB , 2V/div
C: V VFB , 2V/div
D: V LX1 , 10V/div
40µs/div
0V
0V
8V
A
B
C
D
0V